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Karel Opočenský (7 February 1892, Most, Bohemia – 16 November 1975, Prague) was a Czech chess master.
He was four-time Czech Champion (1927, 1928, 1938, and 1944). In 1919, he took 2nd, behind František Schubert, in Prague (Czechoslovak Chess Championship). In 1925, he tied for 3rd-4th in Paris (Alexander Alekhine won). In 1927, he won in Česke Budějovice (CSR-ch). In 1928, he won in Brno (CSR-ch). In 1933, he won at Prague (the 10th Vaclav Kautsky Memorial). In 1935, he took 4th in Bad Nauheim (Efim Bogoljubow won).
In 1935, he took 4th in Łódź (Savielly Tartakower won). In 1935, he won in Luhačovice. In 1936, he took 2nd, behind Henryk Friedman, in Vienna. In 1937, he took 2 nd, behind Karl Gilg, in Teplice (Teplitz Schönau). In 1938, he won in Nice. In 1938, he tied for 1st with Hermann in Prague (CSR-ch).[1]
Karel Opočenský played for Czechoslovakia four times in the Chess Olympiads.
He won individual gold and team silver medals at Folkestone 1933 and at Prague 1931, team bronze.[2]
When World War II broke out, Opočensky, Jan Foltys, and František Zíta were playing for the Bohemia & Moravia team in the 8th Chess Olympiad in Argentina. They chose to return home, whilst team-mates Jiří Pelikán and Karel Skalička elected to remain in South America.
In 1940, Opočensky took 2nd, behind Foltys, in Rakovnik (Bohemia and Moravia-ch). In 1941, he drew a match with Foltys in Prague (+4 –4 =4) and took 7th in Trenčianske Teplice (Foltys won). He also placed 13th in the Munich 1941 chess tournament (Europa Turnier), the event being won by Gösta Stoltz. In 1942, he tied for 4-5th in Prague (Duras Jubileé) behind joint winners, Alekhine and Klaus Junge. In 1943, he took 3rd in Prague (B&M-ch; Zita won). In 1944, he won in Brunn (B&M-ch).
After the war, he played in several international and local (Czechoslovakia) tournaments. In 1945, he tied for 2nd-3rd, behind Emil Richter, in Prague. In 1946, he took 4th in Ostrava (CSR-ch; Luděk Pachman won). In 1946, he took 4th in London. In 1946, he tied for 1st with Daniel Yanofsky and Pachman, in Arbon. In 1947, he took 4th in Vienna. In 1949, he tied for 3rd-6th in Vienna. In 1949, he tied for 4-5th in Arbon. In 1956, he took 3rd in Poděbrady (CSR-ch, Ladislav Alster won).
In 1951 and 1954, he was the chief arbiter for the World Chess Championship matches in Moscow, and also in the 10th Olympiad at Helsinki 1952, and in the 2nd Candidates Tournament at Zurich 1953.
Opočenský is also known as a theoretician. There are two opening variations named after him: the Opocensky Variation in the Grünfeld Defence (1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Bd2)[3] and the Opocensky Variation in the Sicilian Defence (1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2).[4]
Awarded the IM title in 1950, he became an International Chess Arbiter in 1951.